A pre-Christmas storm dusted the Great Plains and the eastern front of the Rocky Mountains with snow. From the pattern of snowfall, the moist air probably moved north from the Gulf of Mexico and met with cold Arctic air to produce snow. The north-south line of the Rocky Mountains seemed to act as a barrier to keep the moisture to their east. The strip of land visible on the west side of the mountains is relatively free of snow. The snow highlights the paths of many rivers, in particular, the Arkansas River in Kansas and Colorado along the top of the image. Along the center left edge of the image, most of New Mexico is visible. To its right are Texas and Oklahoma. A corner of Northern Mexico is visible in the lower left corner of the image. The Moderate Resolution Imaging Spectroradiometer (<a href="http://modis.gsfc.nasa.gov">MODIS</a>) on NASA’s <a href="http://terra.nasa.gov/">Terra</a> satellite acquired this image on December 25, 2004. Sensor: Terra/MODIS. Data Start Date: 12/25/04.